Locking element



FIG. 1 is a rear, top, and left side perspective view of a locking element showing the new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 a bottom plan view thereof.

The portions of the design shown in broken lines show unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a locking element, as shown and described. 